KR20160044853A - A method and apparatus for data transmission and reception of Machine Type Communication devices in mobile communication - Google Patents

Abstract

The present invention relates to an LTE protocol, and to a technology designing entity of an LTE protocol in layer 2. The objective of the present invention is to provide a data transmitting and receiving method for providing a solution for reducing signaling or traffic overhead due to increase of the number of terminals, and suggesting a design of layer 2 more suitable for an MTC communication mode. Specifically, the present invention relates to the data transmitting and receiving method which comprises: receiving packet data convergence protocol (PDCP) setting information from an external communication device; determining whether or not data of a received PDCP protocol data unit (PDU) is compressed according to the received PDCP setting information; and decompressing the data when the data is compressed depending on a determination result.

Description

[0001] The present invention relates to a method and apparatus for data transmission and reception of a MTC terminal in a wireless communication system,

The present invention relates to an LTE protocol, and more specifically, the present invention relates to a technique for designing an entity of an LTE protocol at Layer 2.

Machine Type Communication (MTC) or Machine to Machine Communication (MTC) refers to a form of data communication associated with one or more entities that do not require human intervention. MTC (Machine Type Communication) includes a plurality of wireless communication means such as a wireless local area network (WLAN) and a 3G / 4G communication network for a wireless terminal, It is a technology to provide information service. MTC has developed a technique for solving a selective connection and a continuous service between a service server and a mobile wireless terminal because a mobile terminal of a user receiving services for a plurality of wireless communication devices has mobility.

In particular, the MTC service using mobile communication is currently being performed. Specifically, telematics, security, automatic meter reading (AMR), payment, remote maintenance and control (RMC : Remote Maintenance and Control, Health, and Consumer Device. And the application range is gradually expanding.

In 3GPP, the MTC service has a low mobility (low mobility), a time-controlled data transmission only for a defined time, a time tolerant of data transmission, Priority alarm message, Packet switched only, and Small data transmission.

In general, the performance or capability of MTC terminals used in a cellular network is lower than that of a general cellular communication terminal such as a smart phone. Depending on the operation type of the terminals, it can be classified into terminals for human type communication (HTC) and machine type communication (MTC). HTC means that the transmission of signals is determined by Human and the signals are transmitted and received. MTC means that each terminal transmits its own signal periodically or by event occurrence without human intervention.

The number of MTC terminals is gradually increasing. In this case, the overhead of signaling and traffic to be handled in the MTC communication may occur. In recent years, there has been an increasing discussion at the optimized RAN (Radio Access Network) level for MTC communication systems.

SUMMARY OF THE INVENTION The present invention provides a method for reducing signaling or traffic overhead caused by an increase in the number of terminals in a communication apparatus. We also propose Layer 2 design which can be more suitable for MTC communication method.

According to an aspect of the present invention, there is provided a method of receiving data from a communication apparatus in a wireless communication system, the method including receiving a control message including PDCP (Packet Data Convergence Protocol) setting information from an external communication apparatus, Determining whether or not data of a PDCP protocol data unit (PDCP PDU) received by the communication device is compressed according to the setting information; and decompressing the data when the data is compressed as a result of the determination do.

According to another aspect of the present invention, there is provided a method of transmitting data in a communication apparatus in a wireless communication system, the method comprising: determining data compression of a PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) Compressing the data of the PDCP PDU, and transmitting the compressed data to an external communication device.

Also, a data transmitting and receiving apparatus in a wireless communication system according to an embodiment of the present invention receives a control message including Packet Data Convergence Protocol (PDCP) setting information from a communication unit for performing data communication and an external communication apparatus, (PDCP) PDU (Protocol Data Unit) received by the communication device according to the PDCP setting information, and releases the decompression of the data when the data is compressed .

The apparatus for transmitting and receiving data in a wireless communication system according to an embodiment of the present invention determines a data compression of a communication unit for performing data communication and a PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) of data to be transmitted, And a controller for compressing the data of the PDCP PDU according to an algorithm and transmitting the compressed data to an external communication device.

According to various embodiments of the present invention, the overhead of signaling and traffic can be alleviated even if the number of terminals increases in the MTC communication scheme.

1 is a diagram showing an example of the configuration of a machine type communication (MTC) system,
2 is a diagram showing another example of the MTC (Machine Type Communication) system configuration,
3 is a diagram illustrating a portion of a downlink LTE protocol,
4 is a diagram showing a part of an uplink LTE protocol,
5 is a diagram illustrating a process of transmitting data between a PDCP layer and an RLC layer,
6 is a diagram illustrating a data flow in a conventional PDCP entity,
7 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.
8 is a flowchart illustrating a data receiving method according to an embodiment of the present invention.
9 is a diagram illustrating a data flow in a PDCP entity when a data transmission / reception method according to an embodiment of the present invention is applied;
10 is a diagram illustrating a method of transmitting data related to a compression algorithm of data of a PDCP PDU,
11 is a diagram illustrating a message flow for determining whether to compress data of a PDCP PDU in a data transmission / reception method according to an embodiment of the present invention;
12 is a diagram illustrating PDCP setting information included in a control message in a data transmission / reception method according to an embodiment of the present invention;
13 is a block diagram showing a configuration of a data transmission / reception apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

In describing the embodiments of the present invention, a long term evolution (LTE-A) system supporting Long Term Evolution (LTE) or Carrier Combining of 3rd Generation Partnership Project (3GPP) The subject matter of the present invention is also applicable to other communication systems having similar technical background and channel form, with little variation within the scope of the present invention, It will be possible at the judgment of the person having it.

In this specification, the local access device may not be directly connected to the cellular network but may be a device connected to the network gateway in a wireless LAN, Zigbee, Bluetooth, or the like.

In this specification, a MTC (Machine Type Communication) device may be referred to as a device having a function capable of being directly connected to a cellular network. The MTC device may be connected to a local network as well as a cellular network. Further, the present invention can be described based on the MTC device in its effective aspect, but the device to which the present invention can be applied is not limited to the MTC device, and can be applied to all the communication devices having the communication function.

In the present description, in the LTE protocol, the terms entity or layer may be used interchangeably.

1 is a diagram showing an example of a MTC (Machine Type Communication) system configuration.

Referring to FIG. 1, the MTC system 100 includes an MTC server 107 (MTC Server) provided in an operator domain to provide an MTC service.

That is, in FIG. 1, at least one or more devices constitute an MTC Capillary Network 103, and these MTC sub-networks 103 are configured around an MTC server 107 that provides an MTC service. The MTC user 109 can access the MTC server 107 using an application program interface (API).

The devices herein may be the local access device 101. The local access device 101 does not have a cellular network communication function and the MTC gateway device 105 is connected to the local access device 101 through a local connection method such as IEEE 802.15, Zigbee, Bluetooth, And can be connected to the local access device 101.

The MTC gateway device 105 may also be connected to the operator domain 107 via the cellular network. The local access devices 101 constitute the MTC detailed network 103 around the connected MTC gateway device 105 and perform service for the local access device 101 through the MTC detailed network 103. [ An example of the MTC detailed network 103 is a WLAN as a short-range wireless network, and the local access devices 101 are a WLAN access point device. A typical example of the operator domain 107 is a 3G / 4G communication network.

2 is a diagram showing another example of the configuration of an MTC (Machine Type Communication) system.

In the MTC system of FIG. 2, at least one or more devices form an MTC subnetwork. However, the devices herein are not limited to local access devices but may be connected to a 3GPP wireless network or the like, that is, an MTC device 201). Also, the local access device and the MTC device 201 in FIG. 1 can form an MTC detailed network together. In this case, the local access devices may be connected to the MTC gateway device 203 using a local access method. That is, the MTC gateway device 203 can be connected to the local access device through a local connection method such as IEEE 802.15, Zigbee, or Bluetooth.

The MTC devices 201 may also communicate directly with the network using a cellular network connection or may be connected to the network through an MTC gateway device 203. [

Also, although not shown in the drawing, in another embodiment of the present invention, an LTE-DIRECT or D2D communication method may be used to connect to the MTC gateway device.

3 is a diagram showing a part of a downlink LTE protocol.

Referring to FIG. 3, the data to be transmitted in the downlink enters a processing process in the form of an IP packet on an SAE bearer. IP packets entering the processing flow pass through various protocol entities before being transmitted over the air interface.

The PDCP (Packet Data Convergence Protocol) 301 performs IP header compression to reduce the number of bits transmitted on the air interface. The header compression scheme may be based on ROHC (Robust Header Compression), a standardized header compression algorithm used in WCDMA and some other mobile communication standards. In addition, the PDCP 301 is responsible for ciphering and integrity protection of the transmission data.

The PDCP 301 protocol at the receiving end performs decryption and decompression corresponding thereto. The PDCP 301 may have one PDCP entity per SAE bearer.

The RLC (Radio Link Control) 303 is responsible for segmentation / concatenation, retransmission management, and transmission of data to higher layers in order. Unlike WCDMA, since there is only a single node in the LTE radio access network structure, the RLC protocol is also located in the eNodeB. The RLC 303 provides a service to the PDCP 301 in the form of a radio bearer. The RLC 303 may have one RLC entity per radio bearer.

Specifically, the RLC layer 303 includes a role for reconfiguring data received from the PDCP layer 301 to a size designated by the MAC layer 305, a retransmission function for retransmission failure occurring in a lower layer And re-ordering due to the HARQ operation of the MAC layer 305. [0033] FIG.

The MAC (Medium Access Control) 305 can handle HARQ retransmission and uplink and downlink scheduling. The scheduling function is located in a base station (eNodeB), and the base station (eNodeB) may have one MAC (305) entity per cell for uplink and downlink. The HARQ protocol portion may exist in both the transmitting end and the receiving end of the MAC 305 protocol. The MAC 305 may provide a service to the RLC in the form of a logical channel.

Specifically, the MAC layer 305 is located at the lowest layer in the layer 2, and is connected to the PHY layer through a transport channel. In addition, the MAC layer 305 is connected to a logical channel through the RLC layer 303, . In this process, the MAC (305) entity determines the priority of the set logical channels and the amount of data that each logical channel can transmit. Also, the eNB performs a radio resource allocation procedure (Scheduling Request procedure) so that the eNB can appropriately allocate radio resources to the UEs.

4 is a diagram showing a part of an uplink LTE protocol.

According to FIG. 4, the uplink protocol of the LTE protocol is very similar to the downlink described in FIG. That is, although there are some differences in the transport format selection or the multiple antenna transmission, the LTE protocol structure related to the uplink transmission corresponds to the downlink structure, and is replaced with the description of FIG. 3 in this specification.

5 is a diagram illustrating a process of transmitting data between the PDCP layer and the RLC layer.

In general, a data entity from an upper protocol layer or a layer is called a service data unit (SDU), and a data entity to or from a lower protocol layer is called a protocol data unit (PDU).

Meanwhile, the RLC 501 of the LTE system can operate in one of TM (Transparent Mode), UM (Unacknowledged Mode) or AM (Acknowledged Mode), as in the UMTS system.

The TM RLC entity is set as a unidirectional transmission and is set as a transmitting TM entity or a receiving TM entity. In the TM mode, no header is attached to the RLC PDU.

The UM RLC entity is also configured as a unidirectional transmission and is set to either the transmitting UM entity or the receiving UM entity. It is mainly used for transmission of services that are sensitive to propagation delays, such as streaming or voice services, and have some characteristics insensitive to data loss. In particular, in UM mode, RLC PDUs have very brief headers, mainly used for reordering purposes.

The AM RLC entity is set to bi-directional transmission and features lossless data transmission. For this, ARQ mechanism is used to cope with data loss that may occur in the lower layer. And is mainly used for a service having a characteristic requiring error-free transmission, for example, signaling radio bearer (SRB) or TCP type data transmission.

UM and TM RLC entities in LTE are little different from UM and TM RLC entities in UMTS, but AM RLC entities are slightly different with the addition of re-segmentation.

The PDCP layer 503 can perform a security function such as a header compression function, a ciphering, and a integrity check, a selective transmission function for enhancing the efficiency of wireless and wired resources in handover, and the like.

6 is a diagram illustrating a data flow in a conventional PDCP entity.

In FIG. 6, it is assumed that data is transmitted from a base station or an E-UTRAN to a user equipment (UE). On the contrary, the same process is performed when data is transmitted from a UE to a base station or an E-UTRAN.

First, the PDCP performs sequence numbering on data to be transmitted (601). The PDCP may then optionally compress the IP header (603). Header compression may be based on ROHC (Robust Header Compression). After the header is compressed, Integrity Protection is performed only in the Control Plane (605). Specifically, a packet associated with a PDCP SDU may perform Integrity Protection, and a packet not associated with a PDCP SDU may not pass through an integrity protection process.

In step 607, the PDCP encrypts the data packet. In step 609, after the PDCP header containing information necessary for decrypting the terminal is added, the output of the PDCP is input to the RLC.

Although not shown in the figure, the following data flow will be described below.

The RLC protocol performs splitting and / or concatenation on PDCP SDUs, followed by an RLC header. The header is used to identify RLC PDUs in order to transmit and retransmit data in the UE. The RLC PDUs are transmitted to the MAC layer, and a plurality of RLC PDUs are combined into one MAC SDU, and a MAC header is attached to form a transport block. The size of the transport block may depend on the instantaneous data rate selected by the link adaptation. Finally, the physical (PHY) layer attaches a CRC to the transport block for error detection purposes, performs coding and modulation, and then transmits the final signal by radio waves.

In the terminal receiving the transport block, the above-described processes are performed in the reverse order. Specifically, the output of the RLC of the receiving terminal is input to the PDCP. In step 611, the PDCP removes the PDCP header. It can decrypt the encryption and perform Integrity Verification (613,615). As in the transmitting PDCP layer, packets not related to the PDCP SDU can be directly subjected to the header decompressing step without performing the integrity verification step (617). The PDCP may then perform duplicate detection of the lower layer SDUs (619).

7 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

In step 701, the BS may determine whether to compress the PDCP PDU data. For example, the base station may determine to compress the data of the PDCP PDU when the last receiver of the PDCP PDU is the MTC device. However, the case where the base station determines to compress the data of the PDCP PDU is not limited to this. The base station can process data according to the LTE protocol in wireless communication with the terminal, and can compress the payload portion including the data, not the header, with respect to the PDCP PDU. The compression of the PDCP PDU may be different depending on the type of the receiving terminal. If the PDCP PDU is not compressed, only the header is compressed, and only the encryption and integrity protection steps are performed, and the PDCP PDU can be transmitted to the RLC (702).

If it is determined to compress the data of the PDCP PDU, the data portion of the PDCP PDU can be compressed 703 using a preset compression algorithm. In this case, a predetermined compression algorithm can be used in various data compression algorithms.

In the present invention, a method of compressing a payload portion excluding a data portion of a PDCP PDU, i.e., a header, is proposed.

The principle of data compression is to identify the pattern of the data stream. That is, data compression is like choosing a more efficient way of representing the same information. Therefore, applying the data compression algorithm to the data is to eliminate as much redundancy as possible. The efficiency and effectiveness of the compression scheme can be measured by the compression ratio, that is, the ratio of the size of the uncompressed portion to the compressed portion. In general, a 2: 1 compression ratio means that the compressed data is half the size of the original data.

There are many algorithms available for compressing data. Some algorithms are designed to exploit specific mediums and redundancies within the algorithm. However, if applied to data of a different type than the specific medium and redundancies, the effect may be significantly reduced.

For example, the Motion Picture Experts Group (MPEG) standard is designed to use relatively small differences between one frame in video data and the other frames. Therefore, when applied to moving moving images, high performance can be achieved, but not when applied to texts.

One of the most important points in data compression theory is Shannon? There is a theoretical limit known as Limit. Shannon? Limit tells you how much you can compress a given source data. Shannon? If the limit is exceeded, it is impossible to restore the compressed data. Modern compression algorithms use Shannon? I could have reached the limit, but I can never exceed that limit.

Layer 2 data compression may mean compressing the payload portion of Layer 2's WAN protocol. The wireless Internet protocol may refer to any one of PPP, Frame Relay, High-Level Data Link Control (HDLC), X.25, and Link Access Procedure, Balanced (LAPB). The header part of Layer 2 is not included in the compression target. However, the entire payload data portion including the header of the upper layer protocol can be compressed. There is no restriction on the algorithm used to compress the data, but it can be either the Stacker algorithm or the Predictor algorithm.

The compression of the data proposed in the present invention shows a much higher compression ratio in the case of the data of the text type. In particular, the use of compressed data in the MTC Gateway can provide a higher gain as the number of MTC devices increases.

In step 704, the compressed data may be transmitted to the RLC.

8 is a flowchart illustrating a data receiving method according to an embodiment of the present invention.

The receiving apparatus receives information about the algorithm used for compressing the data of the PDCP PDU from the transmitting apparatus in advance (801).

The receiving device may then receive a control message including PDCP configuration information (802). Here, the receiving apparatus may receive a control message including both information on the algorithm used to compress data of the PDCP PDU and PDCP setting information, and may include information on an algorithm used to compress data of the PDCP PDU And a control message including PDCP setting information.

The configuration information of the PDCP may include at least one parameter indicating whether or not the data of the PDCP PDU is compressed. Specifically, the receiving apparatus may include at least one of information indicating whether a PDCP PDU received by the receiving apparatus is compressed, a maximum context index (maxCID) information, and at least one profile address supporting a data compression algorithm.

Information on the control message and the compression algorithm of the PDCP PDU data can also be transmitted through RRC signaling.

According to the PDCP setting information, in step 803, it is determined whether or not the received PDCP PDU is compressed. If it is not compressed, it can be processed according to the processing process of the conventional PDCP PDU. If the PDCP PDU is compressed according to the PDCP setting information, the PDCP PDU can be decompressed using the information about the compression algorithm of the received PDCP PDU and the PDCP setting information (804).

9 is a diagram illustrating a data flow in a PDCP entity when a data transmission / reception method according to an embodiment of the present invention is applied.

In FIG. 9, it is assumed that data is transmitted from a base station or an E-UTRAN to a user equipment (UE) as shown in FIG. 6. However, when data is transmitted from a UE to a base station or an E-UTRAN, .

Fig. 9 is the same as the data flow in the PDCP entity of Fig. 6 except that a data compression module is added. That is, the PDCP performs sequence numbering on the data to be transmitted (901). The PDCP may then optionally compress the IP header (902). Header compression may be based on ROHC (Robust Header Compression). After the header is compressed, the data compression of the PDCP PDU can be performed by the present invention (903). After the data compression is performed, Integrity Protection is performed only in the Control Plane (904). Specifically, a packet associated with a PDCP SDU may perform Integrity Protection, and a packet not associated with a PDCP SDU may not pass through an integrity protection process.

In step 905, the PDCP encrypts the data packet. In step 906, after the PDCP header containing information necessary for decrypting the encryption of the UE is added, the output of the PDCP is input to the RLC.

Although not shown in the figure, the following data flow will be described below.

The RLC protocol performs splitting and / or concatenation on PDCP SDUs, followed by an RLC header. The header is used to identify RLC PDUs in order to transmit and retransmit data in the UE. The RLC PDUs are transmitted to the MAC layer, and a plurality of RLC PDUs are combined into one MAC SDU, and a MAC header is attached to form a transport block. The size of the transport block may depend on the instantaneous data rate selected by the link adaptation. Finally, the physical (PHY) layer attaches a CRC to the transport block for error detection purposes, performs coding and modulation, and then transmits the final signal by radio waves.

In the terminal receiving the transport block, the above-described processes are performed in the reverse order. Specifically, the output of the RLC of the receiving terminal is input to the PDCP. In step 907, the PDCP removes the PDCP header. It can decrypt the encryption and perform Integrity Verification (908, 909). Packets not related to the PDCP SDU as in the transmitting PDCP layer may perform the data decompression step without performing the Integrity Verification step (910). After decompressing the data, the header decompressing step may be performed (911). The PDCP may then perform duplicate detection of the lower layer SDUs (912).

10 is a diagram illustrating a method of transmitting data related to a compression algorithm of data of a PDCP PDU.

The E-UTRAN in FIG. 10 denotes an LTE cellular network and can communicate with a terminal through a base station (eNB). The base station may transmit an RRConnectionReconfiguration message to the UE (1001). The RRCConnectionReconfiguration message transmitted by the base station to the UE may include information on an algorithm used for compressing data of the PDCP PDU of the present invention.

When the UE receives an RRC connection re-establishment message from the base station, the UE can transmit an RRC connection re-establishment completion message (1003) in response to the RRC connection re-establishment message.

The RRC connection reconfiguration completion message that the UE transmits to the base station, that is, the E-UTRAN, may include information on the compression algorithm of the data portion of the PDCP PDU of the data transmitted by the UE to the base station.

11 is a diagram illustrating a message flow for determining whether to compress data of a PDCP PDU in a data transmission / reception method according to an embodiment of the present invention.

Referring to FIG. 11, the RRC may trigger the PDCP layer to compress the data portion of the PDCP PDU.

In step 1101, the RRC may transmit a message instructing compression of data of the PDCP PDU to the PDCP layer. The parameters contained herein may include algorithms used for compression, and various algorithms may be used.

In step 1103, the PDCP may transmit the response in response to the RRC compression activation message.

In addition, when the compression of the data of the PDCP PDU is disabled, the RRC may transmit a Disable Compression message so as not to compress the data of the PDCP PDU (1105).

In this case, it is the same as the step 1103 that the PDCP can transmit a response thereto (1107).

12 is a diagram illustrating PDCP setting information included in a control message in the data transmission / reception method according to the embodiment of the present invention.

According to FIG. 12, the PDCP setting information can be divided into parts indicating header compression and data compression, and each part indicates information indicating whether the PDCP PDU transmitted / received by the communication device according to the present invention is compressed, A maximum context index (maxCID) information, and at least one profile address that supports a data compression algorithm.

13 is a block diagram showing a configuration of a data transmission / reception apparatus according to an embodiment of the present invention.

Referring to FIG. 13, a data transmission / reception device 1300 to which an embodiment of the present invention can be applied may include a communication unit 1301 and a control unit 1303. Although only the communication unit 1301 and the control unit 1303 are shown in FIG. 13, it is specified that the communication unit 1301 and the control unit 1303 can be separately designed into a plurality of separate configurations according to the choice of the implementer.

The communication unit 1301 can perform wired or wireless data communication. The communication method that can be performed by the communication unit 1301 is not limited to any one method, and it is possible to connect not only the cellular network but also the local access method.

The control unit 1303 receives a control message including Packet Data Convergence Protocol (PDCP) setting information from the external communication apparatus and, based on the received PDCP setting information, the data of the PDCP PDU (Protocol Data Unit) It is determined whether or not the data has been compressed. If it is determined that the data is compressed, the data can be decompressed.

Further, the control unit 1303 determines data compression of the PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) of the data to be transmitted, compresses the PDCP PDU data according to a predetermined compression algorithm, and transmits the compressed data to the external communication device Lt; / RTI >

Further, before determining data compression of the PDCP PDU (Data Convergence Protocol Protocol Data Unit) of the data to be transmitted, the control unit 1303 performs control including information on a predetermined compression algorithm and PDCP (Packet Data Convergence Protocol) Message can be transmitted.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are illustrative and explanatory and are intended to provide further explanation of the invention as claimed. no. It should also be understood that the embodiments of the present invention described above are merely illustrative, and that those skilled in the art will be able to make various modifications and equivalent embodiments. Accordingly, the true scope of the present invention should be determined by the following claims.

1300: Data transmission / reception device
1301:
1303:

Claims (18)

A method for receiving data in a communication device in a wireless communication system,
Receiving a control message including Packet Data Convergence Protocol (PDCP) setting information from an external communication device;
Determining whether data of a PDCP protocol data unit (PDU) received by the communication device is compressed according to the received PDCP setting information; And
And decompressing the data if the data is compressed as a result of the determination. 2. The method of claim 1,
At least one of at least one profile address supporting the compression algorithm of the data, information indicating whether the PDCP PDU to be transmitted and received by the communication apparatus is compressed, maximum context index (maxCID) information that the communication apparatus can use, Gt; a < / RTI > 2. The method of claim 1,
(RRC) signal, wherein the radio resource control (RRC) signal is received via a Radio Resource Control (RRC) signal. The method as claimed in claim 1, further comprising, prior to the step of receiving a control message including Packet Data Convergence Protocol (PDCP)
And receiving information on a compression algorithm of the PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) from a base station. 5. The method of claim 4,
(RRC) signal, wherein the radio resource control (RRC) signal is received via a Radio Resource Control (RRC) signal. A method of transmitting data in a communication device in a wireless communication system,
Determining data compression of a PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) of data to be transmitted;
Compressing the data of the PDCP PDU according to a predetermined compression algorithm; And
And transmitting the compressed data to an external communication device. 7. The method of claim 6, further comprising: prior to determining data compression of a PDCP PDU (Data Convergence Protocol Protocol Data Unit)
And transmitting a control message including information on the predetermined compression algorithm and PDCP (Packet Data Convergence Protocol) setting information. [8] The method of claim 7,
At least one of at least one profile address supporting the compression algorithm of the data, information indicating whether the PDCP PDU to be transmitted and received by the communication apparatus is compressed, maximum context index (maxCID) information that the communication apparatus can use, And transmitting the data. The method of claim 7, wherein the information about the compression algorithm and the control message are transmitted to the external communication device through a radio resource control (RRC) signal. An apparatus for transmitting and receiving data in a wireless communication system,
A communication unit for performing data communication; And
Receiving a control message including Packet Data Convergence Protocol (PDCP) setting information from an external communication apparatus, determining whether data of a PDCP PDU (Protocol Data Unit) received by the communication apparatus is compressed according to the received PDCP setting information And a controller for deciding the compressed data if the data is compressed as a result of the determination. 11. The method of claim 10,
At least one of at least one profile address supporting the compression algorithm of the data, information indicating whether the PDCP PDU to be transmitted and received by the communication apparatus is compressed, maximum context index (maxCID) information that the communication apparatus can use, Wherein the data transmission / reception device comprises: 11. The method of claim 10,
And is received via a radio resource control (RRC) signal. 11. The apparatus according to claim 10,
Wherein the information about the compression algorithm of the PDCP PDU (Packet Data Convergence Protocol Protocol Data Unit) is received from a base station before receiving a control message including PDCP (Packet Data Convergence Protocol) setting information from the base station Device. 14. The method of claim 13,
And is received via a radio resource control (RRC) signal. An apparatus for transmitting and receiving data in a wireless communication system,
A communication unit for performing data communication; And
A control unit for determining data compression of a PDCP PDU of data to be transmitted, compressing data of the PDCP PDU according to a predetermined compression algorithm, and transmitting the compressed data to an external communication device; The data transmission / reception apparatus comprising: 16. The apparatus of claim 15,
A control message including information on the previously set compression algorithm and PDCP (Packet Data Convergence Protocol) setting information is transmitted before data compression of the PDCP PDU (Data Convergence Protocol Protocol Data Unit) of the data to be transmitted is determined The data transmission / reception apparatus comprising: 16. The method of claim 15,
At least one of at least one profile address supporting the compression algorithm of the data, information indicating whether the PDCP PDU to be transmitted and received by the communication apparatus is compressed, maximum context index (maxCID) information that the communication apparatus can use, The data transmission / reception apparatus comprising: 16. The method of claim 15, wherein the information about the compression algorithm and the control message comprise:
And transmits the data to the external communication device through a radio resource control (RRC) signal.

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